Sealing pad



' Aug. 27, 1935. H. M. HANSON SEALING PAD Filed Oct. 25, 1934 Patented Aug. 27, 193

-: SEALING-PAD I I-larry lV I. Hanson, Shelbyville, Ind assignor to u I g r The KennedyC'ar Liner and Bag 00., Shelbyv V J ville, Ind-3 acorpo'ration of Indiana Application October 25, 1934, Serial No. 5 I q 4 I 5 Claims. (orpo sey w This invention relates to flexible insulating units particularly adapted for sealing cracks around doors or other openings of a freight car.

The invention has other and more general uses.

with portions of the cargo, to another portion of the unit not so flattened, distending the envelope and improving the insulating efiiciency thereof.

Other objects of the invention will appear as the followingdescription of a preferred and practical embodiment thereof proceeds.

In the drawing which accompanies and forms a part of the following specification, and throughout the several figures of which the same characters of reference have been employed to denote identical parts:

Figure 1 is a perspective view of a freight car doorillustrating the employment of the sealing unit or pad constituting the present invention;

Figure 2 is a cross section taken along the line 22 of Figure 1, the door being shown closed; and

Figure 3 is a perspective view partly in section illustrating the construction of the pad.

, It will be understood that in the shipment of many valuable cargoes such as silk or perishable foodstuffs,.it is essential that the car be sealed against the entrance of dust and moisture, or

against 5 atmospheric heat leakage into the car.

Car liners of one type or another are in extensive use for protecting freight of this character. The

present invention relates to a sheet insulated unit or pad which may be used for general car lining purposes, but has been particularly designed to seal the cracks around the door of a car against the entrance of water'or dust and to prevent refrigeration losses.

The pad I of the present invention is made of paper or any other suitable flexible material and of anydesired length and width, preferably being as long asthe height of the door opening. The

pad comprises an envelope 2 which may be of kraft or any other suitable paper or of waterproof material, the seams of said envelope being preferably tightly pasted together or otherwise closed so as to retain a body of inert air within the -envelopel freelyisurroundsr a J ,core sheet 3, the latter heinglcorrugatedlor other-- wise formed with elevations which maytouch the opposite sides of the envelope holdingthem apart and thus creating an air-cellular structure. 5

It will be noted from Figure 1 that one of the. preferred utilizations of the pad is totack it along the door post with an edge portion 4 freely lapping against the inside of the sliding door. The door,

it will be observed, is not ordinarily a plane sur- 10 face, but is constitutedby recessed panels-5 and elevated braces 6. In order that the lapped portion 4 shall'be an effective seal, it is essential that it lie not only against the braces B, but also against the surfaces of the panels so that it mustbe very l5 freely flexible in a horizontal direction. It is also essential that it be flexible in a vertical direction so asto readily conform to the corners of the door post and the angle between. the door v post and door. 20

To obtain this flexibility in both directions, the core sheet is'corrugated both ways as ,isindicated 1 and 8, and it will be understood that no claim is made to the core sheet per se, which is a patented article and in the fabrication of the 25 v present invention, the core sheet is purchased ready-made. If, as in ordinary corrugated board, the front and back sides 9 and i0 ofthe envelope were pasted to the peaksof the corrugations, the;

pad would be very stiff and unbendable due to the 30 fact that it would be'necessary in bending the. strip, to elongate the envelope between adjacent corrugations on the convex: side of, the bend; which would be impossible if the envelope were pasted to the corrugations. This is clearly suggested in 3 Figure 2, where, if the outer side l0 were in adherence with the peaksat II and H, the intervening part I3 of the sheet could not elongate and stretch and therefore the'unit could not be bent between H and I2. By having the envelope en- 40 tirely free from the core sheet it offers no impediment to the easy flexing of the core sheet in both directions.

Another advantage of the free relation of th envelope to the core sheet is that when aportion I of the pad is pressed by the cargo and flattened so angle iron. This is conventional car door con- 55 struction; The insulating pad I is tacked to the what I believe to be a preferred and practical embodiment of my invention, it will be understood to those skilled in the, art that the specific details as shown and described are merely by way of example and" not to be construed as limiting the scope of the invention as claimed.

What I claim is: I 1. Sealing pad comprising a flexible envelope, andzanflexible co'rrugatedcore sheet freely en- --closedwi'thin said envelope: 1

:of this simple invention, the

2. Sealing pad comprising a flexible envelope, and a. flexible core sheet enclosed within said envelope, said core sheet being corrugated in perpendicular directions.

3. Sealing'pad comprising a flexible waterproof envelope, and a flexible core sheet enclosed within said envelope, said core sheet being corrugated in perpendicular directions,- H

4. Sealing pad comprising a flexible envelope, and a flexible corrugated core sheet enclosed within said envelope; the peaks of certain corrugationsof said core sheet freely contacting the adjacent sides of said envelope.

,5. Sealing pad comprising a flexible envelope and -a"flexible core sheet, enclosed within said envelope, said core sheet being corrugated, said corrugations being lineally co-extensive with the "sheet and arranged in perpendicular directions.

HARRY M. HANSON. 20 

